Spatial dynamics of the red grouper Epinephelus morio(Pisces: Serranidae) on the Campeche Bank,Gulf of Mexico

摘要

The spatial dynamics of the red grouper Epinephelus morio plays a fundamental role in the fishery managementon the Campeche Bank, where it is overfished. The objective of this study was to characterize the spatial dynamics of thispopulation. We used a dynamic model of spatial distribution to estimate population movement rates between adjacent areas.The model was applied using information on catch per unit effort and length-frequency distributions for the Mexican midsizedfleet that operated in the area in the period 1973-1977. These data were chosen to ensure that the information wouldreflect the condition of the resource before overfishing. It was possible to quantify the spatial dynamics of the red grouperand the results were consistent with previously known movement patterns. The results showed different movement ratesand temporal patterns of movement for different population sectors. The spawning aggregations and the seasonal upwellingoccurring in the eastern part of the Bank were considered as key factors influencing the pattern of population movements.